I was under the impression that it was illegal to to "pin open" a telestock and then install it on a post ban rifle. "Too easily converted back" was the reason why. Even Blind pins I read right here on the forum were not good enough. So when I was explaining to a fellow who wanted to build a post ban carbine, I said you have to get one of the full length buffer tube look a like stocks to be legal. He Had a collapsible and was going to pin it open.
So, the other day I am nosing through a gun shop (a favorite activity of mine) and I see a DPMS Panther Lite sitting on top of it's box just after it had been unpacked. Now I just glanced at it with no real interest till I saw the buttstock and what looked to be a collapsible tele stock. Upon further examination I discovered it was a collapsible telestock that two blind pins had been driven through the plastic stock into the track on the bottom of the buffer tube. I thought this was not kosher. Does anyone know for sure?
IPSC_GUY sends

DPMS has made illegal configurations before and sold them, based on THEIR interpretation of the law instead of on BATF's. For example, they used to sell rifles with permanently-attached A2 flash suppressors, based on the notion that the military called them "compensators" instead of flash suppressors. BATF wasn't amused.
One part of me says, "Go DPMS! These laws suck anyway." But the other part says, "You guys are selling rifles in illegal configurations that could result in innocent people getting busted because they assume that factory rifles must be legal, which is WRONG."
Either way, BATF would not approve a stock that was as you described. Of course, it IS possible that someone switched the stock after it left DPMS, so I wouldn't harbor any ill will towards them without first verifying how the rifle left the factory.
-Troy